Abstract
Ice nucleating barriers of undetermined composition are known to occur in floral buds of several cold hardy species, including Azalea. Fluorescence microscopy indicated the presence of phenolic-rich areas within hardy Azalea flower buds, which could be ice barriers. Hardy buds were subjected to a sublethal heat stress of 45 o C For 2 h to disrupt barrier integrity. Two hours after treatment the low temperature exotherms (LTEs) of flowers were observed using differential thermal analysis (DTA). The LTEs of buds exposed to heat stress were either fewer in number and/or occurred at higher temperatures than in controls
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